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Motor control system and interface

a technology of motor control and interface, applied in the direction of motor/generator/converter stopper, dynamo-electric converter control, instruments, etc., can solve the problems of affecting the speed range and efficiency of the motor with this three-wire schem

Active Publication Date: 2015-12-17
ALLEGRO MICROSYSTEMS INC
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AI Technical Summary

Benefits of technology

The invention relates to an interface between a motor controller and a motor driver that allows for both speed control and motor feedback signals to be carried over a single conductor. The interface includes a digital-to-analog converter (DAC) and a peak detector. The DAC receives a PWM motor speed control signal from the motor controller and generates an analog motor speed control signal for the peak detector. The peak detector then generates an analog motor speed command signal for the motor driver. The technical effect of this invention is improved speed control accuracy and stability, as well as efficient communication between the motor controller and motor driver.

Problems solved by technology

However, the motor speed range and efficiency can suffer with this three-wire scheme.

Method used

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Embodiment Construction

[0014]Before describing the present invention, some introductory concepts and terminology are explained. As used herein, the terms “voltage level” and “signal level” mean the voltage magnitude of the respective DC signal. The terms “discontinuous signal” and “discontinuous analog signal” both mean an analog signal generally having a non-zero voltage level wherein the signal voltage level may drop to zero in a near instant and subsequently jump back to the non-zero voltage level. The term “desired speed” means the speed at which a motor controller instructs a motor driver to operate motor. The term “average pulse width” means the average pulse width within a pulse width modulated signal taken over a constant time period.

[0015]FIG. 1 shows a motor control system 10 for controlling a motor 22. The control system 10 includes a motor controller 12, a motor driver 14, and an interface 16. The motor controller 12 includes a motor speed control output terminal 12a, motor speed feedback inpu...

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Abstract

A motor control system is presented. The motor control system includes a motor controller and a motor driver. The motor controller and motor driver are coupled by an interface which includes a conductor configured to carry both a motor speed control signal from the motor controller to the motor driver and a motor feedback signal from the motor driver to the motor controller. The motor controller provides a motor speed control signal to the motor driver and the motor driver provides a motor feedback signal to the motor controller.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]Not applicable.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH[0002]Not Applicable.FIELD OF THE INVENTION[0003]This invention relates generally to electronic motor control circuits and methods and, more particularly, to such circuits and methods that respond to an external motor speed control signal without requiring an additional, dedicated connection.BACKGROUND OF THE INVENTION[0004]Circuits to control and drive motors, such as brushless DC (BLDC) motors, are known. Some motor driver circuits control the motor speed by providing a variable motor supply voltage that is generated by a variable motor supply voltage circuit based in part on a motor feedback signal. This speed control scheme has the advantage of not requiring a dedicated motor speed control input to the driver circuit, since the only connections required are the supply voltage, ground, and feedback signal connections. However, the motor speed range and efficiency can suffer...

Claims

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Application Information

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IPC IPC(8): H02P29/00
CPCH02P29/00H02P6/08H02P6/10H02P29/10
Inventor REYNOLDS, TIMOTHYHWANG, DENNISKIM, WALTERROWAN, THOMAS
Owner ALLEGRO MICROSYSTEMS INC
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